html,
body {
    height: 100%;
    width: 100%;
    background-color: #fff;
}

.main {
    height: 100%;
    width: 100%;
    background-color: #fff;
}

.phonelogin {
    width: 300px;
    height: 40px;
    color: #fff;
    background: #37a3ff;
    text-align: center;
    margin: 30px 30px;
    border-radius: 5px;
    font-size: 16px;
}

.btnbox {
    display: flex;
    justify-content: space-around;
    align-items: center;
    font-size: 14px;
}